// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
#define NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_

#include <stddef.h>

#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "net/base/ip_endpoint.h"
#include "net/quic/quic_connection.h"
#include "net/quic/quic_packet_writer.h"
#include "net/quic/quic_protocol.h"

namespace net {

class IPAddress;
class QuicBlockedWriterInterface;
class UDPServerSocket;
struct WriteResult;

// Chrome specific packet writer which uses a UDPServerSocket for writing
// data.
class QuicSimpleServerPacketWriter : public QuicPacketWriter {
public:
    typedef base::Callback<void(WriteResult)> WriteCallback;

    QuicSimpleServerPacketWriter(UDPServerSocket* socket,
        QuicBlockedWriterInterface* blocked_writer);
    ~QuicSimpleServerPacketWriter() override;

    // Use this method to write packets rather than WritePacket:
    // QuicSimpleServerPacketWriter requires a callback to exist for every
    // write, which will be called once the write completes.
    virtual WriteResult WritePacketWithCallback(const char* buffer,
        size_t buf_len,
        const IPAddress& self_address,
        const IPEndPoint& peer_address,
        PerPacketOptions* options,
        WriteCallback callback);

    void OnWriteComplete(int rv);

    // QuicPacketWriter implementation:
    bool IsWriteBlockedDataBuffered() const override;
    bool IsWriteBlocked() const override;
    void SetWritable() override;
    QuicByteCount GetMaxPacketSize(const IPEndPoint& peer_address) const override;

protected:
    // Do not call WritePacket on its own -- use WritePacketWithCallback
    WriteResult WritePacket(const char* buffer,
        size_t buf_len,
        const IPAddress& self_address,
        const IPEndPoint& peer_address,
        PerPacketOptions* options) override;

private:
    UDPServerSocket* socket_;

    // To be notified after every successful asynchronous write.
    QuicBlockedWriterInterface* blocked_writer_;

    // To call once the write completes.
    WriteCallback callback_;

    // Whether a write is currently in flight.
    bool write_blocked_;

    base::WeakPtrFactory<QuicSimpleServerPacketWriter> weak_factory_;

    DISALLOW_COPY_AND_ASSIGN(QuicSimpleServerPacketWriter);
};

} // namespace net

#endif // NET_QUIC_TOOLS_QUIC_SIMPLE_SERVER_PACKET_WRITER_H_
